I have the same problem aswell i'm using a DMS 4 Pro i readed it at 1X and wrote at 1X aswell i used DVD Decrypter and i used 2 diffrent blanks one was infinti and the other one is TDK much expensive! But it still crashes at the loading?

The only 2 games i have backedup and are not good, are
ShellShock Nam '67 & Call of Duty
Both i've made backup of and they just not playable, and give my PS2 a bluddy rough time with loading ect. It's got me real pissed off to painfully wait too slow!!!.

Also i have done Driv3R with TDK and it works fine!. Now isn't that wierd.

try changing your media to dvd-r.
i have a messiah 2 installed,use infiniti dvd-r x4,dvd decypter,also on satin silver ps2,my copy of call of duty works flawlessly.
have you checked whether this game needs dvdloader for your swapmagic?
nam 67 is a bit of a bitch
ps...try patching this game